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首页> 外文期刊>Bulletin of Materials Science >Magnetocaloric response of La0.70Ca0.1Sr0.2Fe0.1Mn0.9O3 pervoskite for magnetic refrigeration
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Magnetocaloric response of La0.70Ca0.1Sr0.2Fe0.1Mn0.9O3 pervoskite for magnetic refrigeration

机译：磁致冷La0.70Ca0.1Sr0.2Fe0.1Mn0.9O3钙钛矿的磁热响应

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摘要

The complex magnetic materials La0.70Ca0.1Sr0.2Fe0.1Mn0.9O3 (LCSFMO) and La0.70Ca0.1Sr0.2MnO3 (LCSMO), applicable for the magnetic cooling, have been explored. The X-ray diffraction patterns show that these samples are in single phase with rhombohedral structure. A remarkable decrease in the Curie temperature from 346 to 223 K was observed for 10% of Fe doping at Mn-site in the LCSMO sample. The substitution of Mn by Fe results in a combination of doping disorder, a site-percolation and Mn-Fe super-exchange interactions, which suppresses the ferromagnetism. The maximum magnetic entropy change of 1.53 J kg(-1) K-1 with field variation of 3 T was obtained for the LCSFMO sample. The relative cooling power (RCP) similar to 120 J kg(-1) was found for an applied magnetic field of 3 T. The comparable magnetic entropy change and RCP values suggested that the studied samples have potential as a refrigerant for cooling applications.
机译：研究了适用于磁冷却的复合磁性材料La0.70Ca0.1Sr0.2Fe0.1Mn0.9O3（LCSFMO）和La0.70Ca0.1Sr0.2MnO3（LCSMO）。 X射线衍射图表明这些样品为单相，具有菱面体结构。在LCSMO样品中，在锰位点处掺入10％的铁时，居里温度从346 K显着降低到223K。 Fe替代Mn会导致掺杂紊乱，位点渗流和Mn-Fe超交换相互作用的组合，从而抑制了铁磁性。 LCSFMO样品的最大磁熵变为1.53 J kg（-1）K-1，场变化为3T。在施加3 T的磁场时，发现相对冷却功率（RCP）类似于120 J kg（-1）。相当的磁熵变和RCP值表明，研究的样品具有作为制冷剂用于冷却应用的潜力。

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